Improvement in speaking-tubes



B. HOWARD 8L J. BEADLE.

n -Speaking-Tube.

No. 162,476. l Patented Apr|27,1a75= UNITED STATES BENJAMIN HOWARD AND JESSE BEADLE, OF SHIGKSHNNY, PA.

IMPROVEMENT IN SPEAKING-TUBES.

Specification forming part of Letters Patent N0. 162,476, dated April 27, 1875;

application ltd April 2, 1875.

To all whom t may concern:

Be it known that we, BENJAMIN HOWARD and JESSE BEADLE, of Shickshinny, in the county ot' Luzerne and State ot' Pennsylvania, have invented certain new and useful Improvements in Alarm Attachments to Speakingrlubes; and we do hereby declare the following to be a full, clear, and exact description ot' the invention, such as will enable 0thers skilled in the art to which it pertains to make and use it, reference being had to the accompanying drawings, which form part of this specification.

Uur invention relates to an improvement in alarm attachments to speaking-tubes; and it consists in attaching to the speaking-tube a cylinder and piston, by means of which the air contained inthe tube is suddenly forced up or down, as the case may be, which air pushes a globular valve against a hell or gong, thereby giving the alarm, as will be more fully described hereafter.

rlhe accompanying drawing represents our invention.

A represents a speaking-tube, and which extends in any direction desired. To the speaking-tubes are attached nloutlrpieces B, which are closed when not in use, by valves or otherwise, and opened by hand when wanted. At any place from whence communications are to be made is attached to the speaking-tube a cylinder, U, provided with a piston and a rod, D, which rod has a knob at its outer end and is to he operated by hand. This piston moves freely in the cylinder and returns to its position by its own weight after having been suddenly pushed upward. The effect produced by the sudden concussion of the air is extended throughout the length ot the tube. At the place to which the communication is directed, a globular valve, E, closes the tube, and this valve, when struck by the air is lifted from its seat and violently thrown up against the gong or bell F, secured to the upper end of the tube, immediately over its mouth. The alarm thus given may be repeated in rapid succession, the globular valve returning` to its seat by recoil and its own weight as suddenly as it was lifted from it. Instead of using the piston-rod D to give the alarm, it may be done by blowing into the tube by bellows or with the mouth.

Having thus described our invention, we claim- An alarm attachment for speaking-tubes, coi'isisting of the combination ot' the spealc ingtube A, cylinder C, piston-rod D, valve E, and bell or gong F, substantially as shown.

ln testimony that we claim the foregoing, we have hereunto set our hands this 29th day of March, 1375.

BENJAMIN HOWARD. JESSE BEADLE. E'Titnesses:

HARRISON BRIGHT, M. l). FowLER. 

